Sewing machine



H. w. KRAG SEWING MACHiNE Nov. 24 1925.

Filed Sept. 8, 1922 Patented Nov. 24, 1925.

UNETED STATES PATENT OFFICE.

HARRY W. KRAG, OF ST. LOUIS, MISSOURI, ASSIGNOR T0 AMERICAN SHOE MACHIN- ERY & TOOL COMPANY, OF ST. LOUIS, MISSOURI.

SEWING Application filed September To all whom it may concern:

Be it known that I, HARRY W. KRAG, a citizen of the United States, and a resident of the city of St. Louis, and State of Mis souri, have invented a new and useful Inr provement in Sewing Machines, of which the following is a specification.

This invention relates to sewing machines of the type wherein the rotating shuttle has a removable bobbin case eccentrically and non-rotatably mounted therein, whereby said bobbin case moves through an orbit as the shuttle rotates.

One of the principal objects of the present invention is to provide means for non-rotatably securing the eccentric bobbin case in position without obstructing the passage of the needle thread loop around the shuttle. Another object is to provide for the ready insertion or removal of the bobbin case.

The present invention consists principally in the hereinafter described arrangement for attaining the above objects; and it also consists in the combinations and arrangements of parts hereinafter described and claimed.

In the accompanying drawing wherein like symbols refer to like parts wherever they occur; Y

Fig. 1 is a front elevation of a portion of the shuttle head of a sewing machine provided with a combined shuttle and bobbin case retainer embodying my invention;

Fig. 2 is a similar view showing the movable section of the retainer moved clear of the bobbin case to permit withdrawal thereof; and

Fig. 3 is a transverse section through the )arts shown in Figs. 1 and 2, the section eing taken through the pivot for the operating lever for the movable section of the retainer onthe line 3-3 in Fig. 1.

Referring to the accompanying drawing,

my invention is shown in connection with a sewing machine comprising a shuttle head MACHINE.

s, 1922. Serial No. access.

(not shown), and an abutment 10, adapted to be engaged, in a usual manner, by the shuttle driver 7 located at the forward end of the shuttle driving shaft 11.

The bobbin case 8 comprises a cylindrical casing or shell, which fits within an eccentric recess provided therefor in the front face of the shuttle 6 and is provided with an axially projecting stud 12 upon which is supported a bobbin 13. The front wall of the bobbin case 8 is provided with a hole 14 for the passage of the bobbin thread (not shown).

The shuttle 6 is rotatably mounted in a circular recess provided therefor in the front face of the shuttle head 4 and is removab-ly secured in position by means of an arcuate retaining plate comprising a main section 15, which is secured to the shuttle head by screws 16, and a terminal section 17, which is pivotally secured to said shuttle head by means of a pivot screw 18. The inner marginal portions of both sections of the arcuate retaining plate overlap the edge of the shuttle receiving recess a distance sufficient to retain the shuttle therein. The inner edge of the retaining plate is formed with segments or circles, forming a sealloped inner edge portion adapted to engage a similarly scalloped edge portion of the bobbin case. That is, the inner edge of the retaining ring has a series of circumferentially spaced arcuate lips or lugs 19, adapted to cooperate with a similar series of circumferentially spaced arcuate notches or recesses in the edge of the bobbin case.

By this arrangement one of the retaining lips or lugs 19 of the retaining member is at all times in engagement with an adjacent notch or recess 20 in the front face of the bob-bin case, thereby retaining said case in position; and the arcuate surfaces of the cooperating lugs 19 and recesses 20 of said retaining member and said bobbin case, serve to prevent rotation of said bobbin case with the shuttle and thus force the bobbin case to move through an orbit.

A very important advantage of this construction is that it not only holds the shuttle and bobbin case in working position and prevents rotation of the bobbin with the shuttle but it also does not interfere with the loop of thread that is cast around the bobbin case; for the space or gap between the throat of the shuttle and the lugs 19 of the retaining member is at all times uniform.

The pivoted section 17 of the scalloped retaining member is swung clear of the bobbin case receiving recess in "the shuttle, to permit insertion or removal of the bobbin, by means of a hand lever 21. This hand lever is pivotally secured to theshuttle head by means of a pivot screw 22, which passes through a cam opening 28 in the pivoted section 17 and is threaded into the shuttle head. This opening is larger than the pivot screw 22 which projects therethrough and is adapted to receive a tongue 24, which projects inwardly from the hub portion of the operating lever 21. The shape of this opening is such that rotation of'the'operating lever causes the tongue 24 thereof to bear against the walls ofsaid opening and force the pivoted "section 17 to turn onits pivot 18 and swing the retaining lug 19 thereof clear of the edge of the bobbin case or across the same, according to the direction in which the lever is swung.

When it is desired to remove the bobbin case, the notch or recess 20 thereof that cooperates with the retaining lip 19 of the pivoted section 17 is brought into engagement with said recess by rotating the shuttle. The lever 21 is then swung upwardly, which action swings the retaining lip of the pivoted'section clear of the bobbin case, thereby permitting said bobbin case to be withdrawn from the'recess in the shuttle. After 'the bobbin case is replaced, the lever 21 is swung down against the pivot 18, which action swings the 'retaining lip of the pivoted section of the retaining member into engagement with the recess-es 20 therefor in the bobbin case, whereby axial and rotary movement of said bobbin case in said shuttle is prevented.

It is obvious 'that'numerous changes may be made without departing fromthe invention, and I do not wish to be limited "to the precise construction shown.

hat I claim is:

1. A sewing machine comprising a 1'0- tatably mounted shuttle, a bobbin case eccentrically mounted in said] "shuttle, and means on said machine for retaining said bobbin case in position, said means comprising a plurality of oircumferentially spaced projecting lips adapted to overlap the edge of said bobbin case, said bobbin case being formed with a plurality of circumferrntially spaced recesses adapted for engagement with said Iipathereby preventing rotation of said bobbin casewithsaid shuttle.

2. A sewing machine comprising a shuttle head, a shuttle rotatably mounted therein and provided with a recess, a bobbin case mounted in said recess and an arcuate plate on said shuttle head and overlapping the edge of said shuttle, the overlapping portion of said plate being formed with a plura-lity of projecting lips, adapted to cooperate with corresponding recesses in said bobbin case, to prevent rotation of said bobbin case with said shuttle.

3, A sewing machine comprising av shuttle head, a shuttle rotatably mounted therein, a bobbin casemounted in said shuttle,means onsaid shuttle head for securing said bobbin case in said shuttle and said shuttle in said shuttle fhead, said means comprising a plurality of :proj-ecti'ng lips, one of said lips overlapping the edge of said bobbin case in every position thereof, one of said lips being capable of being moved clear of the path of said bobbin case,whereby the bobbin case may -be r en ov;ed-, and a lever for actuatingsaid-movable l-i-p.

4. A sewing machine compiisinga; shuttle head, a shuttle rotatably mounted therein, an arcuate plate secured to said shuttle head imposition to overlap the edge ofsaid shuttle to retain the same in position, a bobbin case mounted in said shuttle, said plate being formed with a plurality of projecting lips, one Gfsaidl-i'ps overlapping-the edge of said bobbin case in every position thereof, thereby securing said bobbin case in position, said bobbin case being formed with a plurality of recesses -adapt'ed for engagement with said lips,-thereby {preventing rotation of said bobbin case with said shuttle. I

5. A sewing machine comprising a shuttle head, :-a shuttle rotatabl-y mounted therein, an arcuatepla te secured to said shuttle head in position to overlap the "edge of said shuttle to retain the same in position, a bobbin case mounted in"said-'shuttle, said plate being formed with a plurality of projecting lip's, one of said lips overlapping the. edge ofsaidbobbin'case ineveryiposition thereof,

thereby securing said bobbin case in posi tion, said bobbin case being formed with a plurality of recesses adapted for engagement with said lips, thereby preventing rotation of said bobbin case with said shuttle, one of said lips being capable of being moved clear ofthe path of'said bobbincase, whereby the bobbin case may be 'removed. Signed at St. Louis, Missouri, this 6th dayof September, 1922.

HARRY V. KRAG. 

